vDash

This dashboard is running on simulated data so you can see it working end-to-end. Swap in real readings with whichever path matches your hardware:

1. ESP32 / Arduino + DHT22 or SHT31 sensor: have the board POST JSON ({"zone":"freezer","temp":-19.2,"humidity":54}) to a small local server (Node-RED, Flask, or a tiny Express app), then have this page poll that server's endpoint every few seconds instead of the simulator.
2. MQTT setup (Home Assistant, Mosquitto, Tasmota/Zigbee sensors): bridge MQTT to the browser with a WebSocket broker (e.g. Mosquitto's built-in WS listener) and subscribe from this page — no custom backend needed.
3. Cloud IoT platform (ThingSpeak, Blynk, AWS IoT, Ubidots): most expose a REST endpoint for the latest reading — call that on an interval instead of the simulator.

In the code, replace the simulateReading() call inside tick() with a fetch() to your real endpoint. For quick manual testing, every zone is also wired to a global hook:

window.ColdChain.ingest("freezer", -21.4, 52)  // (zoneId, temperature, humidity)

Paste that into the browser console (with your real value) to see it flow through the readout, chart, and alerts immediately.